extraction de couleur facilitée par la fermentation décomposition, Farbextraktion durch Fermentiern Zersetzung, extracción de color ayudada por la fermentación decomposition, eastóscadh datha le cabhair ó choipeadh dhíscaoileadh
After finding a bag of sliced avocado pits in the freezer (and sneaking them out before I could get reminded how long they’d been in there), I decided to go for fermentation. I read somewhere that the potentially damaging (to the fibre) effect of adding an alkaline substance to aid in colour extraction would be negated by allowing the liquor with plant material left in to ferment. Hmm… wouldn’t the addition of bicarb or anything similar prevent fermentation?
I tried anyway and was right in that the mixture did not ferment. However, leaving it for some time – how long? dunno – allowed the sliced pits to partially disintegrate. The liquor was noticeably richer (redder) in colour and the plant material was dense enough to be strained out of the liquid before dyeing. The mould that had formed on top separated easily, too.
The results were not sufficiently different from dyeing without pre-treatment to warrant such a lengthy procedure, although I may well try fermenting without adding bicarb in future.
The two cotton samples did show some variation in tone between mordanted (alum acetate) and non-mordanted, not in depth of colour.
Persea americana, peaux et noyeaux d’avocat, Avocadoschale u. Kerne, cáscara y semillas de aguacate, craiceann is síolta avocado
This will probably be the last dyepot for a while (he says) and let’s face it, the bag of frozen, sliced avocado pits is in danger of being evicted for more deserving residents of the top tray.
I still have a jar of slowly-fermenting pit slices in the laundry awaiting a skein of cotton, but wanted to see how the pits and skins turned out on wool – without a ferment or any other long preparation involving alkalines that might damage the fibre.
200% wof pits were simmered for 45 minutes, the liquor strained over the skeins, followed by a further 45 minutes’ simmering. The bottom row shows the results with an alum/CoT mordant (2, 4 & 6) only darkening (dirtying? or maybe “saddening”) the shades slightly, the bicarb modifier (3 & 4) darkening the pink, and the vinegar modifier (5 & 6) lightening it.
As for the peel (top row), 200% wof dried (all that I had) was soaked in water kept (on-and-off) at approximately 60oC for an hour or two, then again strained over the skeins to be kept at approximately 60oC for another hour. All except the first (no mordant, no modifier) came out more brown than pink/red despite the liquor being a nice shiraz mataro colour, with the mordant and bicarb working together (4) to bring out a honey colour.
Try one more time? I have plenty of frozen and dried pits, but will maybe save these for an upcoming workshop rather than risk being buried under piles of pink skeins. I’ ve tried, Mary Ellen, I’ve tried…
I choose wine by the quality (together with the price), but when the bottle comes in an organza bag, that’s an added bonus. I now have a sizeable collection and there’s always at least one hanging on the washing line at any time of the year. In summer there can be a good half-dozen.
Leaves are generally tied in a bundle to hang off the laundry door for a week or so, but when flowers are plucked one or a small handful at a time, they go into the wine bags (gift bags, not goon bags) on the back wire of the clothes line where they get shade 24/7. This also goes for tagetes heads which would otherwise shed hundreds of seeds over the floor.
I originally spread some wire fencing over the “rafters” in the shed, placed flyscreen wire on top and spread dahlia flowers over that to dry. Now I find that if there are not too many in one go, they too can go into a wine bag. This is only practical in summer, where they can dry within a day; in winter the tree dahlia heads go mouldy when piled into a bag.
And avocado pits? When a colleague donates them on a daily basis, they stay on my desk shelf at work and dry well without going mouldy. Easy! At home they get put into a bag along with the skins – after going over both with a nail brush to get rid of any remaining flesh.
On the right: half-a-year’s harvest of lemon myrtle from the 50cm-high specimen in a pot. I remember buying 100g of these about 18 years ago when they were $50/kg! Although they’re not native to SA, they’re really easy to grow both in pot and in open ground.
I’ve been saving avocado pits and skins for a number of months, but the contribution from a colleague (thanks, Rhonda!) far outweighed – literally – the amount that I got through over the summer.
The pits were halved, sliced, then either dried or frozen; the skins were ripped into smaller piece, then dried. The dye liquor was made by soaking the relevant parts in water, then adding either bicarb or ammonia, then steeping the cotton yarn in this for a few days.
The photo, as always, doesn’t really show the true colours, especially as we’re in autumn and the sky is overcast, but the bottom row were all attained by adding bicarb to draw out the red. The yarns all turned out various depths of pale pink.
With the two on top, the left was from 20g dried skins (purple ones) soaked for a few days, then for a few days more with ammonia, then a few more again with the yarn. In real life, it’s slightly darker.
The one on the right was from 100g frozen, sliced pits following the same method above. The ammonia definitely brings out a deeper shade.
Now, what to do with with five balls of cotton in antique pink? Actually, I’ve thought of one use, but that’ll have to wait.